Conveners
Polarimetry at Future Facilities
- Dave Gaskell (Jefferson Lab)
The physics scope of the Belle II experiment currently acquiring data at the SuperKEKB collider will expand with a polarized electron beam upgrade, as recently proposed. Among the required elements for this upgrade, a real time diagnosis of the polarization is necessary to ensure it is large for all bunches in the accelerator during its regular operation. This will be realized by inserting a...
The Electron-Ion Collider will be the first collider to use both polarized electron beams and polarized protons and light ions. This will offer unique opportunities to study the structure of protons and nuclei and answer fundamental questions in QCD. The uncertainties on the polarization measurement translate directly into the uncertainties of final physics observables. Hence, a precise...
At RHIC, the calibration of the absolute beam polarization is based on the elastic proton-proton scattering from a polarized hydrogen gas jet target (HJET) in the CNI region. The nuclear polarization of the HJET itself is determined with a Breit-Rabi polarimeter. Electron and hadron beam polarizations of 70% with 1% absolute error are to be provided for the EIC (Electron Ion Collider). This...
Polarized $^3$He beam is a crucial capability envisioned for EIC, whose development is underway. Measuring the polarization of the $^3$He beam is thus critical for a productive scientific program. We plan to develop and commission an absolute $^3$He polarimeter based on $^3$He--$^3$He elastic scattering at RHIC, similar to the HJet based proton polarimeter currently in operation, which also...
